package com.example.myapplication91;

import android.Manifest;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.provider.ContactsContract;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private static Manifest.permission permission;
    ArrayAdapter<String > adapter;
    List<String> contactsList=new ArrayList<>();
    private MainActivity Mainfest;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ListView contactsView=(ListView) findViewById(R.id.contacts_view);
        adapter=new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1,contactsList);
        contactsView.setAdapter(adapter);
        if(ContextCompat.checkSelfPermission(this,Mainfest.permission.READ_CONTACTS)!= PackageManager.PERMISSION_GRANTED){
            ActivityCompat.requestPermissions(this,new String[]{
                    MainActivity.permission.READ_CONTACTS
            },1);
        }else{
            readContacts();
        }
    }
    private void readContacts(){
        Cursor cursor=null;
        try{
            cursor= getContentResolver().query(ContactsContract.CommonDataKinds.
                    Phone.CONTENT_URI,null,null,null,null);
            if(cursor !=null){
                while(cursor.moveToNext()){
                    String displayName=cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
                    String number=cursor.getString(cursor.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
                    contactsList.add(displayName+"\n"+number);
                }
                adapter.notifyDataSetChanged();

            }}catch (Exception e){
            e.printStackTrace();
        }
        finally {
        if(cursor!=null){
            cursor.close();
        }
        }
    }
    public void onRequestPermissionsResult(int requestCode,String[] permissions,int[] grantResults){
        switch (requestCode){
            case 1:
                if(grantResults.length>0&&grantResults[0]==PackageManager.PERMISSION_GRANTED){
                    readContacts();
                }else{
                    Toast.makeText(this, "You denied the permission", Toast.LENGTH_SHORT).show();
                }
                break;
            default:
        }
    }
}
